What is "hasamba"

Hasamba (or Hasamb"a, or Chasamba, , an acronym for חבורת סוד מוחלט בהחלט; Havurat Sod Muchlat Behechlet; lit. "The Absolutely Absolute Secret Group") is a series of children's adventure novels, written by Yigal Mossinson. The stories are a chronicle of the heroic exploits of a group of children from Tel Aviv as they assist the underground Haganah in its struggle for Israeli statehood against the British. Subsequent books revolve around assisting the security forces, including the IDF, against Israel's external and internal enemies. It became the most popular series of pocket books ever written in Israel (over a million copies sold), and part of the Israeli culture.